Various concentration methods for water layers and/or soil extracts are examined to achieve analytical sensitivity of agrochemical residues, while obtaining adequate recovery (defined as 85 to 115% recovery) using a <sup>14</sup>C tracer. Concentrating soil extracts is challenging due to possible difficulty of maintaining stability of the parent compound and its degradation products throughout the concentration procedure and the increased concentration of soil matrices especially when using an acidic extraction solvent or under harsh conditions (i.e. microwave or reflux extractions). In addition, the soil matrices can suppress signals and produce sub-optimal chromatography. Using <sup>14</sup>C-radiolabel, the parent compound and its degradation products are traced in order to determine effective methods for concentrations while reducing soil matrices and further degradation. For a given agrochemical, a method is selected based on the nature of the compound (such as polarity, acidity, volatility, stability in water, etc.), extraction solvents used, the sample matrix, and the initial concentration of the analyte in the sample.

Concentration methods of aquatic or soil/sediment samples in preparation for chromatographic analyses

254th National Meeting (2017)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.